The Sand Point Naval Air Station first became operational in June 1920. It was expanded in October 1926, when the Carkeek family sold some of their land to King County, and it was then deeded to the U.S. Navy for further development of the Naval Air Station. The new construction included the use of the Works Project Administration for filling Mud Lake and Pontiac Bay. The Air Station reached its peak during World War Two when numerous new buildings and landing strips were built and over 7,000 military and civilian personnel worked on the grounds. After World War Two, the use of the Air Station slowed, and it was deactivated on June 30, 1970. The land is now a park called Warren G. Magnusun Park.